(CNN) - Among Republican senators, an invitation to the party's convention next month in Minneapolis might just be the easiest ticket to score in town.

Amid news several Senate Republicans have already backed out of attending the quadannual event, Minnesota Sen. Norm Coleman made clear Monday he wouldn't attend either - if the convention was anywhere else but his backyard.

"The colleagues who don't come are staying at home only because they have tough races," the embattled senator told Minnesota Public Radio. "If the convention wasn't in St. Paul, I wouldn't be at the convention,"

Coleman, like many of his colleagues who have opted not to make the trip to Minnesota, faces a tough re-election battle this fall and may be wary of tying himself to the unpopular GOP brand.

Coleman's rivals are slamming the comments.

"Senator Coleman must think Minnesotans haven't noticed that he has made his political career off the Republican label and willingly hitched his star to George W. Bush," Democratic-Farmer-Labor Party
Chair Brian Melendez said in a statement.

Coleman's comments come only days after Pat Roberts, the two-term senator from Kansas and former Chairman of the Senate Intelligence Committee, announced he's skipping the convention to instead focus on his tougher-than-expected reelection bid.
Earlier: Another Republican senator skipping convention

A handful of of other vulnerable Senate Republicans have flatly said they will not attend, including Susan Collins of Maine, Gordon Smith of Oregon, Ted Stevens of Alaska, and Elizabeth Dole of North Carolina.

Two other vulnerable Republicans — New Hampshire Sen. John Sununu and Mississippi Sen. Roger Wicker — have yet to announce their convention plans.